Paper coating machine



Jan.'17, 19 1 P. A. PETERSON PAPER COATING MACHINE 2 Sheets-Sheet 1Filed Feb. 26; 1959 Wk ZIWMA- 1951 P. A. PETERSON 2,968,279

PAPER COATING MACHINE 2 Sheets-Sheet 2 Filed Feb. 26, 1959 set up tocoat either side of a web -tofie used selectively United States Patent f2,968,279 PAPER COATING MACHINE Philip A. Peterson, 350 Salisbury St.,Worcester, Mass. Filed Feb. 26, 1959, Ser. No. 795,804

3 Claims. (Cl. 118-407) This invention relates to machines for coatingwebs of p aper and the like, and more particularly it concerns a noveltrailing blade coating machine especially adapted to coat both sides ofa web of paper. 7

As is well known to those skilled in the art, one type of machine usedfor applying a liquid coating to a web of paper to enhance its qualityis a trailing blade coating machine. In a machine of this type, the webof paper to be coated is passed over a resilient roll and a sharp bladeis pressed against it. The coating liquid is located immediately abovethe blade in a trough-like reservoir having one side open to expose theliquid to the web. Both the blade and the reservoir form a part of thesame assembly which includes a precision positioning mechanism for theblade and adjustable end panels or dykes for the reservoir whereby themachine can be adapted to accommodate webs of different widths.

With such a machine as this, the web must be led around the coating rollin one direction only, because the leveling action of the blade mustcome at the end of the coating process. This has made it awkward, if notimpossible, to set up for optionally coating either side of the Webdepending upon the kind of paper wanted. Hitherto, the alternative hasbeen to provide two coating machines. This requires an unduly largeinvestment, however, because of the high unit cost of each machine andalso it is wasteful of floorspace. A still is that the systems of feedand guide rolls which lead the web to and from a coating station must beduplicated.

An object of the present invention, therefore, is ,to provide a trailingblade coating machine which can be of paper with a minimum of effort.

A more specific object is to provide a coating machine having twoseparate head assemblies that are adapted according to the direction inwhich the web is led around the backing roll.

The novel features of the invention together with further objects andadvantages thereof will become apparent from the following detaileddescription and the drawing to which it refers.

1 Fig. l is a view in ing to the invention;

Fig. 2 is a sectional view of the machine taken on the line 2-2 of Fig.1;

Fig. 3 is a diagrammatic view showing a system of guide rolls suitablefor use with the machine according to the present invention when it isdesired to coat the felt side of a web of paper, and

Fig. 4 is a diagrammatic view showing another system of guide rollssuitable for use when it is desired to coat the wire side of a web ofpaper.

As shown in Figs.

11 designates a backing roll around which is passed a web 12 to becoated. The body of the backing roll is made of metal such as cast ironbut its surface is covered with a resilient material such as rubber.There is a rigid elevation of the machine accordfurther dis advantage 1and 2 of the drawing, the numeral 2,968,279 Patented Jan. 17, 1961 iceshaft 13 that extends from either end of the roll 11 and to rotatablymount the shaft there are provided a pair of'pillow blocks 14 and 15.The pillow blocks in turn are fastened to the base of the machine 16 andthere is a gear 17 on one end of the shaft 13 for driving the roll.

In the region between the gear 17 and the pillow block 15 there is areduction in diameter of the shaft 13 so as to form a shoulder 18.Abutting the shoulder is a head support member 19 which is adapted to besupported pivotally by the shaft and yet free to remain stationary whilethe shaft and the roll rotate. To this end, support member 19 isprovided with a U-shaped slot to receive the shaft and there is abearing flange 21 on the shaft to which the support member is bolted.

At the other end of the shaft, outboard of the pillow block 14, a headsupport member 22 is mounted on the shaft in like manner. Support member22 is similar to support member 19 except that it has a segment gear 23formed as an integral part thereof adjacent to the roll. In mesh withthe segment gear is a spur gear 24 carried by a shaft 25. Shaft 25 isrigidly connected to the output shaft of a gear box 26 by a coupling 27.The gear box, in turn, is driven by a hydraulic motor 28 which, like thegear box, is fastened to the base of the machine 16.

As best shown in Fig. l, a pair of head assemblies are carried byopposite ends of the support members, each of the head assembliescomprising in the main, panels 31 through 34 which form the reservoirfor the coating liquid, and a jaw 35 to clamp a blade 36 and holdertherefor in position immediately beneath the panel or member 31. Thislatter panel together with panels 3'2. and 33 extend in an unbroken lineparallel and adjacent to the face of the roll, terminating just short ofthe head supporting members where they are joined to end plates 41 and42. Panel 34 on the other hand is formed in two separate sec- Betweeneach section and the roll prevent the coating liquid from flowing outthe ends of the reservoir. The dykes are also laterally adjustable sothat the machine can be adapted to accommodate webs of different widths.These, as well as other details of the head assembly, are shown more indetail in my copending application Serial No. 771,778, jointly with JohnP. Munton filed on November 4, 1958, now US. Patent No. 2,918,899, andthe copending application Serial No. 771,888 of John P. Munton andMilton Dentch filed on the same day.

Rigidly joined to each of the plates 41 and 42 are shafts 45 and 46whereby each head assembly is mounted for linear movement with respectto the support members. More particularly, guide blocks 47, 48 and 51,52 having horizontal slots therein to receive the shafts 45, 46 arefastened to either side of the support members, the latter beingprovided with mating slots 53, 54. This permits the head assembly to bemoved toward and away from the backing roll so that the blade can bedisengaged therefrom at will. Pneumatic linear actuators or pistons 61are employed to move the head assemblies, and each piston has associatedtherewith a cylinder housing 62 which is pivotally connected to themember 19 by an arm 63. "The pistons themselves are pivotally connectedto arms 64 which, in turn, are keyed to a shaft 65 so as to form cranks.Shaft 65 is journaled between the members 19 and 22, and mounts a pa'rof eccentric earns 66 which, as shown, are located approxi matelyopposite the plates 41, 42 respectively. By means of straps 67 thefollowers 68 of the cams are operatively connected to the shaft 65.

With reference now to Fig. 3, it will be observed that the heads areoriented angularly in the same manner as in Figs. 1 and 2 and that theweb is led around the adapted for angular movement about the axis ofsaid roll,--saidheads being constrained .to move in concert paper rollsand 'is passed aroundthefirst of "these; guide rolls 71.*From'guide-roll 70 theren's a vertical-traverse of the Web downward tothe roll 71 vvhich is"located The'webth'enfeeds' up- 10 said rollandtodi'sable thepther-Obsaid heads, and means-to, produce rotation ofsaid roll 1n said selected direction.

Web around the backing roll in a clockwise direction, comprising abacking roll mounted for rotation in a nd rolls 75 and 76 serve tolead'it' away. Thereafte 15 selected direction which depends upon theside of the the web traverses a series of drying cylinders, as is'c'onventional.

hand head assembly will havebeen' disabled in like man- 7 Her:therefrom, a pair ofsupp'ort' members for said heads LTo'coat theopposite'side'of' the 'Web, that 'is'the wire s ide, theleft-hand'head'assembly is'moved into 3. A machine for coating'webs ofpaper and the like comprising a backing roll mounted for rotation in aselected direction which depends upon the side of the

